Time-operated smoke-preventer.



.B, L.- AMES. TIME OPERATED SMOKE PRBVENTEB.

APPLICATION PI LBD 001. 17, 1908.

Patented Aug. 31,1909.

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B. L. AMBSQ TIME OPERATED SMOKE PBEVENTER.

APPLIOATIOR' FILED 001. 17, 1908. 932,6 7, Patented Aug. 31, 1909.

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w%%ww r l I Ewe/9% #4 BRADFORD L. ARIES, 0F BOSTON, MASSACHUSETTS.

TIME-OPERATED SMOKE-PREVENTER.

Specification of Letters Patent. Patented Aug. 31, 1909.

Application filed October 17, 1908. Serial No. 458,203.

To all whom it may concern:

Be it known that I, BRADFORD L. Arms, citizen of the United States, residing at Boston, in the county of Suifolk and State of Massachusetts, have invented a certain new and useful Improvement in Time-Operated Smoke-Preventers, of which the. following is a specification, reference being had therein to the accompanying drawings.

My present invention has to do with smoke preventers of, that type in whichair is introduced into the furnace directly over the fire by means of jets of steam' from steam nozzles, the introduction of the air taking place for a limited period of time im mediately after freshcoal has been placed upon the fire.

My present invention has for its object improved means for controlling the supply of air to the furnace, said means being adapted to begin the introduction of air into the furnace when the fresh coal is placed upon the fire and to stop it automaticallyat the expiration of a predetermined period of time, by operating the air dampers of the smoke preventers, and the valve controlling the supply of steam to the steam jets.

My present invention affords means for accomplishing these desirable ends which are simpler than any heretofore employed,

so far as is known to me, and said means are surer to operate perfectly and require less attention and adjustment than the means heretofore employed. As my present invention does not employ electric energy, therenewal of'batteries and the troubles and an-' noyances due to the iimperfectoperation of the batteries is completely eliminated.

The devices comprising my present invention include spring operated means which is set by' the opening ofthe furnace door and released by the operation of a motor-cylinder to which a small stream of water under pressureiis constantly supplied. The length of time during whichlthe introduction of-air into the furnace. continues is regulated by regulating the size ofthe stream ofwater introduced into the motor cylinder and also by adjusting the length of the piston-rod which determines the length 'of stroke of the motor-cylinder. l

The device embodying-my invention has very few parts and said parts are so constructed and located that they are completely and easily accessible in case any derangement or any obstruction occurs.

The invention will be fully understood from the following description taken in connection with the accompanying drawings, and the novel features are pointed out and clearly defined in the claims at the close of the specification.

In the drawings,-Figure 1 is a front elevation of a portion of a boiler provided with smoke preventers and operating means therefor embodying my invention. Fig. 2 is'a detailed view. on a much enlarged scale of the operating mechanism for the smoke preventer.

. Referring now to the drawings,-'At A is indicated the fro-nt of the boiler; at B the furnace doors and at C the ash-pit doors. Above the furnace door B are placed rotary air dampersD, one for each smoke preventer, controlling the supply of air which is introduced into the furnace by the smoke preventer. Steam is supplied to the smoke preventers through the p1pe E, the supplythereof being controlled by the valve F. Across the front of the furnace is located a sliding rod G on each end of which is a rack H engaged by a pinion I. The pinion I is caused to rotate by the opening of the corresponding furnace door by means of an arm J carrying on its end a pin K contacting with the furnace door. A connection to the air damper D is formed by the link L while the spindle of the steam valve F is connected to one of the pinions I and rotates therewith. When either of the furnace doorsB is opened, the rod G is slid longitudinally and the steam valve F and air dampers D are opened, thus setting the smoke preventer in operation. From the foregoing it will be seen that the air dampersand steam valve which constitute the operating means for the smoke preventers are actuated in one direction by the previously described door-operated means. The devices thus far described are old and well known in this art, and my present invention has to do with new and improved devices by means of which the said parts'are restored to their normal position and the steam valve and air dampers closed at the end of the position shown.

V a predetermined period of time. One of said pinions I is provided with a shaft or spindle 11 on the upper end ofwhich is mounted a stopdisk l2'which is caused to rotate whenever the pinion I is moved. A spring 13 tends to restore thestop disk to its normal position after it has been rotated by the movement of. pinion I. j The upper surface of the stop-disk 12 is provided with a series of camshaped projections 14 and above said stopdisk 12 is pivoted at l5a'locking piece 16 provided with a substantially circular surface ofv two different curvatures as shown at 17 and 18, said 'surfacesof difierent curva tures being separated by a very small notch 19. A trigger 2O pivoted at 21 and provided with a surface 22 concentric with the 24 so that it. is allowed to yield upwardly and ride "over the cam pieces 14 as the stopdisk '12is rotated by the shaft 11. When moved.

the parts are in the position shown in full lines in Fig. 2, one of the projections 14 is held ag'ainst the pawl 23 by means of the spring 13and the parts remain in the position there shown until the trigger 20 is WVhen the trigger 20 is moved, the point of the trigger is released from the notch 19 and the pressure upon the pawl 23 1 causes the locking piece 56 to fly up into the position shown in dotted lines and thereby release the stop-disk and allow the spring 13 to rotate it into its original position.

The fluid pressure motor by means of Jwhi'ch the trigger is lifted at the end of the predetermined interval of time to restore the parts to normal position will now be de scribed; At 30 is shown a motor-cylinder within which operates a piston 31 attached to the tubular piston-rod 32. The hole in said piston-rod is a ve'rysmall one and is calculated to allow the air under the piston to escape and thus prevent the formation of an air-cushion. Said tubular piston-rod 32 is made adjustable inlength by means of a tube 33 slipped over the end of the pistonrod 32 and adjustably located thereon by means of the, set screw 34. 7

Water under pressure from a suitable source of water supply is furnished constantly to the motor-cylinder 30 through the water supply pipe 35, the amount delivered to the motor cylinder 30 beingregulat-edby means of the needle-valve 36. The amount required to operate the motor is very small, being under ordinary circumstances not over one quart per hour and only a small pressure is required, a head of seven feet being found sufficient.

An exhaust pipe 37 leads away from the lower end of the motor-cylinder 30 and is furnished with an exhaust valve 38 of the well known straight-way kind. The said exhaust valve 38- is operated by means of'a valve lever 39, the upper end of which is attached by means of a pin and slot connection 40 to the end of the rack rod G which lies across the front of the furnace. The exhaust valve 38 is so constructed that when the parts are in the position shown in 'Fig. 2, it is open sufliciently to allow all the wvater entermg the motor-cylinder through the control valve 36 to trickle out without producing any pressure in the motor-cylinder, and when the furnace doors are opened, the movement of the rack G Will move the valve lever 39 to the right and close the exhaust valve 38, thereby preventingthe escape of the water from the motorcylinder and causing the same to exert a pressure against the piston. 31 in the motorcylinder. 7 j

The opening through the tubular piston rod 32 is very small, but is suflicient to allow the escape of air contained in the motorcylinder 30 beneath the piston 31, so that no aircushi0n shall be formed, and the entire space beneath the piston 31 will be filled with water before the piston starts to move, A port or hole 41 permits any air or any water which has leaked by the piston to escape.

The operation of the hereindescribed device embodying my invention is as follows: VVh'en the fireman opens the furnace door B, to place fresh coal upon the fire, the movement of the door acting through the crank arm J and pinion I moves the rack G to the right, thereby opening the air damper D and turning'on the steam valve F. The parts remain in this position until the expiration of the -'predetermined period' of time. During this period of'time air is being introduced through the air damper D by means of the jet of steam.

The movement ofthe rack G causes the stop plate 12 to rotate against the action of the spring 13, and the pawl 23 attached to the locking piece ,1 6rises and falls as it passes over each of the'cani projections-on the stop plate 12. The pawl 23 prevents the stop disk 12 returning to its original position until the locking by the trigger 20. The same movement of the rack G which turns the stop disk 12 also moves the lever arm 39 to the rightand moves the exhaust valve 38, thereby closing piece 16 is released 'i the normally open way through the fl id ing said operating means in the other direcpressure motor. 38 is closed, the water which is constantly flowing into the cylinder30 from the pipe 35 accumulates under the piston 31. and lifts the piston until the upper end of the piston rod 33 strikes the trigger 20 and lifts it, releasing-the locking piece 16. The spring 13 then acts to return the stop disk 12, rack G and connected parts to their original .position, closing the steam valve F, air damper D and again opening the exhaust valve 38.

' When it is desired that less time shall elapse'after the furnace door is opened before the action of the smoke preventer is stopped, I lengthen the piston-rod 32 by moving the tube 33 thereon, so that the piston 31 is required to travel a less distance to bring the upper end of the piston-rod into contact with the trigger 20. This forms a simple and convenient'means of regulating the period of time during which the smoke preventer operates. If, however, further adjustment is required, it may be accomplished by opening or closing slightly the needle valve 36 which controls the amount of water supplied to the motor-cylinder 30. By making the piston-rod adjustable in length as described, a smaller flow of water is used as it would otherwise be necessary to increase the flow of the water to shorten the time the smoke preventer is in operation.

I claim as my invention:

1. In a smoke preventer and in combination with operating means therefor, door operated means for actuating said operating means in one direction, a spring for actuating said operating means in the other 'di-.

rection, a fluid pressure motor to release said sprlng, an inlet therefor constantly open and supplying fluid under pressure to said fluid pressure motor from an independent source of supply, a normally open exhaust valve, and means to close said valve and cause the said fluid pressure motor to act to release the said spring.

2. In a smoke preventer and in combination with operating means therefor, door operated means for actuating said operating means in one direction, a spring for actuating said operating means in the other direc tion, a fluid pressure motor to release said spring, an inlet therefor constantly open and supplying fluid under pressure to said fluid M.

pressure motor from an independent source of fluid supply, a normally open exhaust valve, and connections from said valve to said door operated means whereby the said valve is operated simultaneously with said door operated means.

3. In a smoke preventer and in combination with operating means therefor, door op erated means for actuating said operating When the exhaust valve tion, acatch and trip to hold and release the spring,a piston and cylinder having a piston rod which actuates the said trip, a constantly open inlet supplying fluid under pressure to said cylinder from an independent source of fluid supply, a normally open exhaust valve and connections from said valve to said door operated means whereby said valve is closed by the movement of said door operated means and opened by the movement of said door operated means in the other direction.

4. In a smoke preventer and in combination with operating means therefor, door operated means for actuating said operating means in one direction, a spring for actuating said operating means in the other direction, a fluid pressure motor to release said spring receiving water under pressure from an independent supply and having a normally open way therethrough through which the fluid under pressure flows, and a valve to close said way and cause the said fluid pressure motor to act to release the said spring.

5. In a smoke preventer and in combination with operating means therefor, door operated means for actuating said operating means in one direction, a spring for actuating said operating means in the other direction, a fluid pressure motor to release said spring said motor receiving water under pressure from an independent supply and having a piston-rod which is adjustable in length to determine the length of stroke of the said motor said motor also having a normally open way therethrough through which the fluid under pressure flows, and a valve to close said way and cause the said fluid pressure motor to act to release the said spring.

6. In a smoke preventer and in combination with operating means therefor, door operated means for actuating said operating means in one direction, a spring for actuating said operating means in the other direction, a trigger controlling said spring, a fluid pressure motor having a moving memher to engage said trigger to release the spring said motor receiving water under pressure from an independent supply and having a normally open way through which the fluid under pressure flows, means for adjusting the length of said moving member and consequently the length of time means in one direction, a spring for actuatmeans in one direction, a spring for actuatspring, an inlet therefor constantly open and supplying fluld under pressure to said fluid pressure motor from-an independent 7 souroe ofsupply, a valve in said inlet to regulate the constant supply of fluid, it nor- Ina-11y open exhaust valve, and means to close said valve and cause the said fluid pressure motor to not to release the said 10 spring.

In testimony whereof I nfiix my signature,

in presence of two Witnesses.

BRADFORD L. AMES.

Witnesses GEORGE P. DIKE, Amen H. MoImIsoN. 

